fixes appveyor.yml + and add install to docker whitelist

Author: justadudewhohacks

.dockerignore

@@ -4,6 +4,7 @@ ci/coverage-report
 !package.json
 !binding.gyp
 !lib
+!install
 !test
 !cc
 !data/got.jpg

appveyor.yml

@@ -70,7 +70,7 @@ test_script:
       cd .\ci\envs
       npm install
       npm test
-    ) else ( \
+    ) else (
       cd c:\projects\opencv4nodejs\test
       npm install
       npm run test-appveyor